Registered plumber apprentices by county, open recruitment windows where the state publishes them, and how the apprentice tier fits Idaho's license ladder. Updated nightly.
Idaho has 300 registered plumber apprentices in active status (fiscal year 2025, DOL RAPIDS), placed in 23 counties, 1.5 per 10,000 residents. That is 8.9 apprentices for every 100 employed plumbers in the state, the rate at which the trade is training its own replacements.
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Registered plumber apprentices by county of the apprentice, largest first. Each county links to its plumbers market page.
| County | Apprentices | Share | Per 10k residents |
|---|---|---|---|
| Ada County | 175 | 58% | 3.3 |
| Canyon County | 40 | 13% | 1.6 |
| Kootenai County | 15 | 5% | 0.8 |
| Bonneville County | 14 | 5% | 1.1 |
| Payette County | 14 | 5% | 5.1 |
| Bingham County | 7 | 2% | 1.4 |
| Twin Falls County | 6 | 2% | 0.6 |
| Bonner County | 3 | 1% | 0.6 |
| Gem County | 3 | 1% | 1.4 |
| Jerome County | 3 | 1% | 1.2 |
| Washington County | 3 | 1% | 2.6 |
| Bannock County | 2 | 1% | 0.2 |
| Elmore County | 2 | 1% | 0.7 |
| Idaho County | 2 | 1% | 1.1 |
| Nez Perce County | 2 | 1% | 0.5 |
| 8 other counties | 9 | 3% |
Source: DOL RAPIDS apprenticeship FY2025, active status, county-coded; as of December 31, 2025.
Idaho records apprentices on its own plumber license register as Plumbing Apprentice Registration: 6,135 active apprentice-tier records against 3,987 journeyman records, a ratio of 1.54 apprentice records per journeyman, register read October 6, 2026. The register's apprentice tier and the federal registered-apprenticeship count in the county table are two different systems: a license-register apprentice is anyone the state has credentialed to work under supervision, a registered apprentice is enrolled in a DOL-registered program.
Counts are license records, not people: a holder with more than one license appears once per license, and a contractor license is a business, not a worker.
Credential types the Idaho State Plumbing Board, Division of Occupational and Professional Licenses (DOPL) issues for this trade: Apprentice Plumber (registration), Journeyman Plumber, Master Plumber, (Plumbing Contractor). See how to get a plumber license in Idaho for hours, exams and renewal.
Sources: registered apprentices: DOL RAPIDS apprenticeship FY2025, active status, as of December 31, 2025; employment: BLS QCEW construction x OEWS occupation share (estimate); license tiers: Idaho register read October 6, 2026; population: U.S. Census 2023 estimates.
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